<ARTICLE>       5
<LEGEND>        This schedule contains summary financial information
                extracted from Consolidated Summary Financial Statements and
                Notes included in this Form 10-Q and is qualified in its
                entirety by reference to such financial statements.
<MULTIPLIER>          1,000
<FISCAL-YEAR-END>           DEC-31-1996
<PERIOD-END>          JUN-30-1996
<PERIOD-TYPE>         6-MOS
       
       
<CASH>                                          54,200
<SECURITIES>                                         0
<RECEIVABLES>                                  190,900
<ALLOWANCES>                                         0
<INVENTORY>                                    252,500
<CURRENT-ASSETS>                               588,500
<PP&E>                                       2,672,200
<DEPRECIATION>                             (1,178,600)
<TOTAL-ASSETS>                               2,821,500
<CURRENT-LIABILITIES>                          385,200
<BONDS>                                        347,500
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       117,000
<OTHER-SE>                                   1,541,300
<TOTAL-LIABILITY-AND-EQUITY>                 2,821,500
<SALES>                                      1,242,400
<TOTAL-REVENUES>                             1,242,400
<CGS>                                        1,051,700
<TOTAL-COSTS>                                1,212,400
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,300
<INCOME-PRETAX>                                 29,500
<INCOME-TAX>                                    11,100
<INCOME-CONTINUING>                             17,400
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    17,400
<EPS-PRIMARY>                                         .16
<EPS-DILUTED>                                        0